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Re: [mpls] Concerns about ISD

Haoyu Song <haoyu.song@futurewei.com> Thu, 14 April 2022 16:13 UTC

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From: Haoyu Song <haoyu.song@futurewei.com>
To: Robert Raszuk <rraszuk@gmail.com>
CC: "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] Concerns about ISD
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Subject: Re: [mpls] Concerns about ISD
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Hi Robert,

I’m glad we share the same view. I do believe we should try to keep the complexity in control plane as much as possible and meanwhile make the data plane as simple as possible. But I also realize that  this can be done only to certain extent until we can’t make it simpler. There are some use cases (e.g., slice ID, IOAM trace) which requires the user packets to carry some extra metadata. Chaining them after the MPLS label stack is the least intrusive and simplest way I can envision. In addition, keeping the data plane performance in mind, we should set a strict barrier on admitting use cases to this framework, and sometimes we may have to seek alternative methods. Look forward to your proposal.

Best regards,
Haoyu

From: Robert Raszuk <rraszuk@gmail.com>
Sent: Wednesday, April 13, 2022 1:33 PM
To: Haoyu Song <haoyu.song@futurewei.com>
Cc: John E Drake <jdrake@juniper.net>; Kireeti Kompella <kireeti.kompella@gmail.com>; mpls@ietf.org
Subject: Re: [mpls] Concerns about ISD

Hi Haoyu,

[HS] It’s not about easy or hard to implement, it’s about the tradeoff between performance, cost, flexibility, and extensibility. Unlike the control plane protocols, the design will run in high performance device data plane, so every clock tick counts. In this regard, “Easy” or “Hard” can be and should be evaluated based on a set of solid qualitative and quantitative criteria when we compare different schemes.  We should choose the best design to the best of our knowledge.

I believe this is very well said indeed.

What is apparently being worked on here for months is in my view merely a CPR for MPLS.

Instead IMO (and that is why I brought up the control plane assisted model) MPLS could way exceed capabilities of SR NP without any excessive load on packets or major surgery to MPLS architecture by encoding reference to forwarding behaviour itself instead of just a pile atomic "actions" (irrespective if those are stuffed into ISD or PSD).

So yes - no draft no proposal - I get this. I will write one. When I get to it.

Kind regards,
Robert.

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